/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Library General Public License for more details.  To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map087.c
**
** Mapper #87 (16K VROM switch)
** Implementation by Firebug
** $Id: map087.c,v 1.2 2001/04/27 14:37:11 neil Exp $
**
*/

#include <noftypes.h>
#include <nes_mmc.h>
#include <nes.h>
#include <libsnss.h>
#include <log.h>

/******************************************/
/* Mapper #87 write handler ($6000-$7FFF) */
/******************************************/
static void map87_write(uint32 address, uint8 value)
{
    /* Within range, address written to is irrelevant */
    UNUSED(address);

    /* Very simple: 8K CHR page is selected by D1 */
    if (value & 0x02)
        mmc_bankvrom(8, 0x0000, 0x01);
    else
        mmc_bankvrom(8, 0x0000, 0x00);

    /* Done */
    return;
}

static map_memwrite map87_memwrite[] = {{0x6000, 0x7FFF, map87_write}, {-1, -1, NULL}};

mapintf_t map87_intf = {
    87,                /* Mapper number */
    "16K VROM switch", /* Mapper name */
    NULL,              /* Initialization routine */
    NULL,              /* VBlank callback */
    NULL,              /* HBlank callback */
    NULL,              /* Get state (SNSS) */
    NULL,              /* Set state (SNSS) */
    NULL,              /* Memory read structure */
    map87_memwrite,    /* Memory write structure */
    NULL               /* External sound device */
};

/*
** $Log: map087.c,v $
** Revision 1.2  2001/04/27 14:37:11  neil
** wheeee
**
** Revision 1.1  2001/04/27 12:54:40  neil
** blah
**
** Revision 1.1  2001/04/27 10:57:41  neil
** wheee
**
** Revision 1.1  2000/12/30 06:34:44  firebug
** Initial revision
**
**
*/
